Snmek 1

Anglicky v odbornch pedmtech"Support of teaching technical subjects in EnglishTutorial: Engineering technology

Topic:Tube manufacturing

Prepared by: Ing. Elena Nov

Projekt Anglicky v odbornch pedmtech, CZ.1.07/1.3.09/04.0002je spolufinancovn Evropskm socilnm fondem a sttnm rozpotem esk republiky.

Tube manufacturing

Tubes / Pipes are produced from metallurgical semi-products as follows: rolling drawing extrusion welding Accordingly tubes are either seamless (smooth) or with seam (welded). Tube manufacturing

Tube rolling Tubes (seamless) are mostly produced by rolling. They are further divided to: Hot rolledCold rolled

Manufacturing is divided into two operations:1. Production of hollow pressings, slabs or pierced semi-products2. Semi-products processing into tubes / pipesTube manufacturing

Billet manufacturing:1. Trepanning round semi-products by transversal rolling in piercing mill. a) between two rolls with eccentric axes, b) two discsA) B)

Transversal rolling Mannesmann principle Stiefel principle

Tube manufacturing

2. For further diameter reduction is used so called Pilger Mill Sketch of pilger mill:

Rolling is by two rolls turning in opposite directions on mandrel, thereby thinning tube wall and elongating the tube. Inner and outer diameters are conserved. Tube manufacturing

3.Final operations are calibration and cooling.

Pilger Mill Tube manufacturing

Drawing of high precision tubesCold drawing is mostly done for pipes or tubes of small to medium sizes (from 0,1 to 250 mm), thin to thick walled. For cold drawing is used cold draw bench. Semi products are tubes made by cold rolling of length to 4.5 m. Tube manufacturing

Die tube drawing - drawing power is transferred by tube, its inner diameter or wall thickness is not eliminated by any tool.

Drawing by clamped mandrel - drawing power is transferred by tube (final product)

Tube manufacturing

Manufacturing of welded tubesSeamless tubes are expensive. Welded tubes are cheaper: 1. Welding of strips heated in gas furnaces proceed through profile rolls twisting the strip. Next pair of rolls compress the tube and its edges butt welding them. Producing tubes up to 100mm diameter and 2 to 10mm wall thickness.Production of tubes with butt welding.

Tube manufacturing

Seam welding of tubes. Short tubes with longitudinal seam are welded edges adjusted and welded.Long tubes from strip or flat steel are bended at hold by pulley while welded. Disk electrodes are hold down by great pressure, welding speed is 70 m/min. Tubes of diameter 7 to 700 mm and wall thickness 1 to 20 mm are welded in this manner. Tube manufacturing

Translate:

Types of tube manufacturing?Describe seamless tube manufacturing. Describe pilger millExplain tube cold drawingDescribe manufacturing of welded tubesAnswer these questions:

http://www.ksp.tul.cz/cz/kpt/obsah/vyuka/skripta_tkp/sekce/04.htmhttp://www.ksp.tul.cz/cz/kpt/obsah/vyuka/skripta_tkp/sekce/obsah_kovy.htm

Used literature